Chevy and GMC Duramax Diesel Forum banner

Questions about valve noise...

13298 Views 9 Replies 5 Participants Last post by  ltzgolf
I have a "chatter" noise coming from the passenger's side of my engine, you can hear it best if you crouch down by the front right tire and listen through the wheel well...

The sound only seems to speed up slightly with the rpm, it's consistent no matter the engine temperature...

It doesn't seem to get any louder or quiet down regardless of engine temp

New oil, new oil filter, new fuel filter, no fuel in oil, oil on full mark.
1 - 10 of 10 Posts
typewriter ?
typewriter ?
Yup. tick tick tick tick tick tick tick consistent with the rpm of the engine but never gets louder or softer. Never changes with engine load or temp. Have heard there's no way to get rid of it on the LB7s that have it, so never really pursued it. It would be nice to not hear it though. Everyone always says, 'Man, sounds like it's running a little rough.' or 'Is your fan blade hitting something?' :cool: Runs just fine IMO.

IIRC, I've read where if you put just a tad less oil in it, that that can fix the noise?

- it might have been a tad more oil too, I can't remember.

You hit the nail on the head, brother. tick tick tick tick tick, somewhat speeds up with engine speed, but it doesn't sound like it's matching the engine's speed above idle (I hope that made sense)

Nothing I can do about it? Seriously? Damn, that pretty much sucks. On the other hand, at least I don't have to go dump $1,200.00 into it for a valve adjustment.

It runs great... Just gets on my nerves when it sounds like my valve train is trying to jump out of the hood.
Just my to cents check if this is a cali truck if so you have a vaccumn pump and mine was doing the typewriter replaced the pump and no more tick tick tick
Theunderlord- It does sound kind of like a typewriter now that I think about it... But I hear mine mostly on the passenger's side, and moreso in the front wheel well (passenger's side)... It's running fine, just irritating and worrysome.

ltzgolf- I'll check it out, but I highly doubt it, the original ownership was in Georgia- however, I'm not sure where it was manufactured.
Does this sound familiar?

Duramax Ticking

Bulletin No.: 02-06-01-022H

Date: August 18 2008
Information on Engine Ticking Noise

2001-2007 Chevrolet Silverado (Classic)
2003-2009 Chevrolet Kodiak C4500/C5500 Series
2006-2009 Chevrolet Express
2001-2007 GMC Sierra (Classic)
2003-2009 GMC TopKick C4500/C5500 Series
2006-2009 GMC Savana

with 6.6L Duramax(TM) Diesel Engine (VINs D, 1, 2 - RPOs LBZ, LB7, LLY)


This bulletin is being revised to add model years and remove RPO LMM. Please discard Corporate Bulletin Number 02-06-01-022G (Section 06 - Engine/Propulsion System).

Some of the above vehicles may exhibit a random ticking noise that is most audible on an engine with a coolant temperature of 70°C (158°F) or higher and from idle to approximately 1500 RPM. The noise usually is most noticeable at the rear of the drivers side front wheel well. Customers may also comment about hearing a tick noise inside the vehicle at idle such as when sitting at a drive through window. All 6600 Duramax(TM) diesel engines have this condition; however some are more audible than others. Engine build variation from engine to engine contributes to differences in perceived volume. All Duramax(TM) engines are manufactured to very close tolerances to meet the durability and reliability standards.

This noise is caused by the relationship of the engine cylinder block crankshaft journals bearing inserts and the oil film. This relationship may allow a vibration that resonates through the cylinder block and is heard as a metallic ticking noise. The noise could be described as an irregular ticking or clacking sound like random typing on a mechanical typewriter.

This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when in fact it was masked by other noises in the past. Many manufacturers such as Isuzu Hino Mitsubishi and Nissan report a similar condition in their diesel engines. Testing and engine teardowns with this condition reveal no condition that would affect reliability or durability of this engine.

Dealers should not attempt to compare any customer vehicles exhibiting this noise with other similar vehicles as the noise is different from vehicle to vehicle and this may lead to the incorrect conclusion that the vehicle has a condition. This noise is a normal operating characteristic of the engine. This noise has no short or long term effects on the engine. Do not attempt repairs for this noise.
Important: Replacing the engine or internal components for this noise will not reduce or eliminate the noise.
See less See more
If you have or had EGR you have a vaccumn pump that is what operates it to the best of my knowledge
1 - 10 of 10 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.